7/6/21, 1
:
58 pm
Energy quiz: Attempt review
Page 1 of 9
?
attempt=2653728&cmid=1446882
Question
Correct
which these concepts are known.
1
Mark 6.00 out
of 6.00
Question
Correct
Mark 7.00 out
of 7.00
Δ
H
for the thermochemical equation
2 SO
(g) + O
(g)
→
2SO (g)
is – 198 kJ,
what is the enthalpy change for the decomposition of 1 mole of SO
to give O
and
SO
, all in the gas state?
Method: Write down the equation of the reaction required (decomposition of SO
to give O
and SO
):
SO (g)
→
SO
(g) +
½
O (g)
Compare this equation with the one for which the thermodynamic information is available, and decide
o
2
2
3
3
2
2
3
2
2
3
2
2
2
Started on
Sunday, 23 May 2021, 3:56 PM
State
Finished
Completed on
Sunday, 23 May 2021, 5:31 PM
Time taken
1 hour 35 mins
Grade
85.00
out of 100.00
Descriptions of concepts used in thermodynamics are provided below. Match these with the names by
which these concepts are known.
Applied to a process that occurs without outside intervention
Spontaneous
!
Applied to a thermodynamic function with values independent of the path by
which the system arrived at a particular state
State
!
A process in which heat is transferred from system to surroundings
Exothermic
!
The sum of all types of energy of all the components of a system
Internal energy
!
Applied to a system at equilibrium under a given set of conditions
State
!
A process in which heat is transferred from surroundings to system
Endothermic
!
The correct answer is: Applied to a process that occurs without outside intervention
→
Spontaneous,
Applied to a thermodynamic function with values independent of the path by which the system arrived
at a particular state
→
State, A process in which heat is transferred from system to surroundings
→
Exothermic, The sum of all types of energy of all the components of a system
→
Internal energy,
Applied to a system at equilibrium under a given set of conditions
→
State, A process in which heat is
transferred from surroundings to system
→
Endothermic
Given that
Δ
H
for the thermochemical equation
2 SO
(g) + O
(g)
→
2SO (g)
is – 198 kJ,
what is the enthalpy change for the decomposition of 1 mole of SO
to give O
and
SO
, all in the gas state?
Method: Write down the equation of the reaction required (decomposition of SO
to give O
and SO
):
SO (g)
→
SO
(g) +
½
O (g)
Compare this equation with the one for which the thermodynamic information is available, and decide
o
2
2
3
3
2
2
3
2
2
3
2
2
Dashboard
/
CHE144 Foundations of Chemistry (s1, 2021)
/
Energy (Weeks 8 - 10)
/
Energy quiz

7/6/21, 1
:
58 pm
Energy quiz: Attempt review
Compare this equation with the one for which the thermodynamic information is available, and decide
what operations are necessary to make them identical.
If you reverse a reaction, you must change the sign of
Δ
H .
If you multiply a reaction through by a factor, you must multiply
Δ
H
by that factor also.
Select one:

Page 2 of 9
?
attempt=2653728&cmid=1446882
Question
Correct
Mark 10.00 out
of 10.00
Methanol is manufactured by the partial combustion of methane under pressure, using a copper
catalyst:
CH
(g) +
½
O (g)
→
CH OH(l)
Enthalpies of
combustion
are (in kJ mol
):
CH
(g), -893
CH
OH(l), -729
3